Sry for the revival but maybe it helps someone. I think that the biggest problem is that a lot of people have (untreated/uncalibrated :) ) rooms/studio monitors and play amp sims through them and say they miss the amp in the room feel. Ofc the 6 7inch speaker on those is not gonna be able to give you the impact that a guitar cab would.
What i did: got a pa speaker with a 12 inch woofer but the most important part, even if my speaker measures flat outside in my room it gets an ugly 13-15db db boost in the 80-200 range that just destroys any guitar tone(plus other problems). So i got a measurement microphone :) and tried to get a flat response out of the speaker around my listening position (you can't fix nulls and other problems without room treatment but still). It did all the difference in the world. (i can recommend dirac, mathaudio roomeq, rew(free),for my monitors i use sonarworks) you can also get Redwire impulses, that for some cabs, have far field measurements with a TC30 ref mic, Mix those in. They come with 0inch measurements + 2m/5ft ones( more useful for headphones,in my opinion). All this helped me get over my amp in the room need. :)
For headphones i recommend sonarworks headphone or toneboosters morphit for headphone calibration(if it has your headphone profile) + some plugin for binaural sound like waves nx.
This is ofc for a practice at home situation :).
I do not recommend to do what i did, i posted this just to maybe give some ideas but i recommend trying a software like dirac, sonarworks, rew etc to see what your speakers are putting out there and for some quick fixes.
One last note for a measurement mic you can get the sonarworks one, is cheap and it comes with a calibration file or an UMIK-1.
